5KP45A/4 Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 5KP45A/4 is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This component is designed for transient voltage protection applications with a 45V reverse standoff voltage rating and 5000W peak pulse power handling capability. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

5KP45A/4

Vishay General Semiconductor - Diodes DivisionIn Stock: 11735KP45A/4 Datasheet

Current PartRFQ

5KP45A

Littelfuse Inc.In Stock: 30585KP45A Datasheet

DirectRFQ

5KP45A-TP

Micro Commercial CoIn Stock: 12455KP45A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5KP45A/4 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 45V
• Power - Peak Pulse: 5000W (5kW)
• Type: Zener, Unidirectional (1 channel)
• Voltage - Breakdown (Min): 50V
• Voltage - Clamping (Max) @ Ipp: 72.7V
• Mounting Type: Through Hole, Axial package
• Applications: General Purpose transient protection

Two substitute parts meet these criteria with identical or equivalent electrical specifications and compatible mechanical packaging.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with current manufacturing status, providing supply continuity for the obsolete 5KP45A/4.

5KP45A (Littelfuse Inc.) is the primary substitute. It maintains identical electrical specifications (45V reverse standoff, 5000W peak pulse power, 72.7V clamping voltage) and uses the same P600 axial package. This part achieves ROHS3 compliance and offers unlimited moisture sensitivity level (MSL 1), improving environmental robustness compared to the original non-compliant part.

5KP45A-TP (Micro Commercial Co) is the manufacturer-recommended alternative. It provides equivalent electrical performance with identical voltage ratings and power handling. The R-6 axial package is mechanically compatible with P600 footprints in through-hole applications. This part also meets ROHS3 compliance and MSL 1 specifications.

Both substitutes are suitable for general-purpose transient voltage protection applications requiring 45V standoff voltage and 5kW peak pulse dissipation. Selection between them depends on package availability, supplier preference, and lead time requirements.

Frequently Asked Questions (FAQ)

Q: Can 5KP45A (Littelfuse) directly replace 5KP45A/4 (Vishay)?

A: Yes. Both parts share identical electrical specifications: 45V reverse standoff voltage, 50V minimum breakdown voltage, 72.7V maximum clamping voltage, and 5000W peak pulse power rating. The P600 axial through-hole package is identical, enabling direct board-level substitution.

Q: What is the difference between P600 and R-6 packages?

A: Both are axial through-hole packages for TVS diodes. P600 and R-6 are equivalent mechanical packages with compatible lead spacing and hole diameter for standard PCB designs. The 5KP45A-TP (R-6 package) is mechanically interchangeable with the original P600 package in through-hole applications.

Q: Why is the original 5KP45A/4 marked as obsolete?

A: The 5KP45A/4 is no longer manufactured by Vishay. Active alternatives from Littelfuse and Micro Commercial Co provide equivalent performance with improved compliance certifications (ROHS3) and unlimited moisture sensitivity levels.

Q: Are there electrical differences between the substitute parts?

A: No. Both 5KP45A (Littelfuse) and 5KP45A-TP (Micro Commercial Co) meet the same electrical requirements: 45V reverse standoff, 50V breakdown minimum, 72.7V clamping maximum, and 5000W peak pulse power. Current - Peak Pulse specification (70.2A) is provided for the Littelfuse part; the Micro Commercial Co part does not list this parameter but maintains equivalent power handling.

Q: Do the substitute parts meet modern compliance standards?

A: Yes. Both 5KP45A (Littelfuse) and 5KP45A-TP (Micro Commercial Co) are ROHS3 compliant and REACH unaffected. The original 5KP45A/4 is RoHS non-compliant, making the substitutes preferable for applications requiring environmental compliance.

Q: What is the operating temperature range for substitute parts?

A: Both active substitutes operate across -55°C to 175°C junction temperature (TJ), providing wide thermal operating margins for industrial and commercial applications.